From: Tom Stellard <tstellar@redhat.com>
Date: Tue, 28 Nov 2017 16:35:04 +0000 (+0000)
Subject: Merging r319130:
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3e430490419645a35399e7937d96482681984e47;p=llvm

Merging r319130:

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r319130 | matze | 2017-11-27 17:17:52 -0800 (Mon, 27 Nov 2017) | 7 lines

ARM: Fix PR32578

https://llvm.org/PR32578

I simplified and converted the reproducer into a lit test.

Patch by Vedant Kumar!
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@319181 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMFrameLowering.cpp b/lib/Target/ARM/ARMFrameLowering.cpp
index 6f380ae2e85..00b788a1b53 100644
--- a/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/lib/Target/ARM/ARMFrameLowering.cpp
@@ -479,7 +479,7 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF,
   if (DPRCSSize > 0) {
     // Since vpush register list cannot have gaps, there may be multiple vpush
     // instructions in the prologue.
-    while (MBBI->getOpcode() == ARM::VSTMDDB_UPD) {
+    while (MBBI != MBB.end() && MBBI->getOpcode() == ARM::VSTMDDB_UPD) {
       DefCFAOffsetCandidates.addInst(MBBI, sizeOfSPAdjustment(*MBBI));
       LastPush = MBBI++;
     }
diff --git a/test/CodeGen/ARM/pr32578.ll b/test/CodeGen/ARM/pr32578.ll
new file mode 100644
index 00000000000..541ba35e5be
--- /dev/null
+++ b/test/CodeGen/ARM/pr32578.ll
@@ -0,0 +1,27 @@
+; RUN: llc -o - %s | FileCheck %s
+target triple = "armv7"
+
+; CHECK-LABEL: func:
+; CHECK: push {r11, lr}
+; CHECK: vpush {d8}
+; CEHCK: b .LBB0_2
+define arm_aapcscc double @func() {
+  br label %tailrecurse
+
+tailrecurse:
+  %v0 = load i16, i16* undef, align 8
+  %cond36.i = icmp eq i16 %v0, 3
+  br i1 %cond36.i, label %sw.bb.i, label %sw.epilog.i
+
+sw.bb.i:
+  %v1 = load double, double* undef, align 8
+  %call21.i = tail call arm_aapcscc double @func()
+  %mul.i = fmul double %v1, %call21.i
+  ret double %mul.i
+
+sw.epilog.i:
+  tail call arm_aapcscc void @_ZNK10shared_ptrdeEv()
+  br label %tailrecurse
+}
+
+declare arm_aapcscc void @_ZNK10shared_ptrdeEv() local_unnamed_addr